Lost internet connection when macbook wakes up

I didn't have any problem with this before until recently. The day before yesterday, when I woke up in the morning and I found out that I have lost the internet connection. I've always set my macbook to sleep after it idles for 1 hour (with that in mind, I never sign off AIM/ICHAT) but never (ever!) lost internet connection. Since then, this always happen everyday.
What happened here? Can somebody help me? Perhaps you could give e a step-by-step trick to make my macbook setting back to normal
Thank you so much
Message was edited by: InThisMoment

OK. thanks. I did manage to find another posting that was very helpful on this problem.
Click on 'More Like This'
Lose internet during sleep
Thanks, guys!

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Lost internet connection when macbook wakes up

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